Choke-valve mechanism



1,634,437 w. scHMlD l GHOKE VALVE MEGHANISM 4 July 5, 1927.

Filed Ju'ne 18, 1926 Patented July 5, 1927.

UNITED STATES PATENT OFFICE.

WILLIAM SCHMID, OF COLDWATER, MICHIGAN, ASSIGNOR TO HARRY A. DOUGLAS,

OF BRONSON, MICHIGAN. f

CHOICE-VALVE MECHANISM.

Application lefl June 18,

My invention relates to the choke valves that are employed in connection with internal combustion hydrocarbon engines of automobiles for the purpose of admitting liquid gasolene into the engines, in starting.

Hitherto, these choke valves have been equipped with operating push and pull rods moved longitudinally by means of sliding handles which are pulled upon when the liquid gasolene is to be admitted to the engines and which are pushed upon when the flow of such gasolene is to be cut off.

It is the object of my present invention to provide a handle which may be turned to secure the valve adjusting movements of the push and pull rod connected with a choke valve. In carrying out my invention, mechanism is employed having one portion connected with the handle to be turned by the hand and another portion reciprocable by the first and connected with the rod to move it longitudinally to secure the desired adjustments of the valve. These two portions of the mechanism which serve to convert the turning movement of the handle into reciprocable movement of the rod are desirably in cam engagement, the portion of this mechanism which is connected with the rod being provided with a gui-de whereby this mechanism portion is restricted to straight line reciprocable movement as the complemental portion of said mechanism is turned.

The invention will be more fully explained in connection with the accompanying drawing in which Fig. l is a front view illustrating the handle of the device of my vinvention as it is assembled with a dash board; Fig. 2 is a side view of the device of my invention in association with piping which serves to convey liquid gasolene to an en,- gine; Fig. 3 is a side view, on a larger scale, illust-rating the cam mechanism of my invention in conjunction with the turning handle and the adjacent end of the push and pull rod; Fig. 4 is a sectional view on line 4-4 of Fig. 5; and Fig. 5 is a sectional view substantially on line 55 of Fig. 3.

The choke valve 1 is disposed within air inlet piping 2 that leads to a carburetor 3 and from which carburetor lpiping 3 leads to t-he engine intake manifold. This choke valve is operated by a push and pull rod 4 which is conn-ected at its forward and lower end with the valve and at its rear and upper 1926. Serial No. 116,861.

derstood. In the preferred embodiment of the invention, the operating member 5 is formed of a spring rod folded at its mid portion to form a T-shaped structure whose stem is formed in two slightly diverging parts 6 and whose head passes through slots 7 in a cylindrical shell 8, these slots desirably being in one plane that includes the axis of the shell. The ends of the T-shaped structure 5 are desirably provided with washers 9 that are held in place by pins 10, the shell 8 being between these washers and so engaging the shell as to spread the portions of the T-stem apart against the resilience of the rod forming this stem, an arrangement that eliminates looseness of the assembly of the T-shaped member 5 with the shell 8 to avoid noise. pull rod 4 is desirably upwardly turned, as indicated at 11, and passes through an opening formed at the right of the rod that forms the T-shaped member 5, a pin 12 passing through the portion at 11 above the member 5 to hold the parts 4 and 5 in assembly. The shell 8 is secured to a mounting plate 13 and this mounting plate is secured to the dash board 14 by means of bolts 15. A handle 16 has a hub portion 17 which is journaled in the mounting plate 13. Another shell 18 is fixed upon the inner end of said hub 17 and is enclosed by the shell 8. The shell 18 has oblique slots 19 through which the ends of the head of the T-shaped member 5 are passed. As the handle is turned, the head of the member 5 moves along the inclined slots 19 and within the straight slots 7, the two sets of slots cooperating to cause straight line movement of the T-shaped member 5 to push or pull the ro'd 4 according to the direction of turning movement of the handle. Referring to Fig. 1, when the handle is pointed to the index line marked Start, the choke valve 1 is closed and when it is pointed to the index line marked Rum the choke valve is open. Springs 2O are interposed between the mounting plate 13 and the shell 18 to hold theA handle hub flange 21 snugly against the mounting plate. The springs 20, which are preferably struck from The push andv ola-im 1. The combination With a choke valve for an internal combustion engine; of a push and pull rod connected With the valve to operate it; a handle mounted to turn; a shell secured to and'eoaxial with the handle and formed with opposite inclined ea'm slots; an. operating `member Connected with said rod and in the form oi" a T constructed of a rod folded at 'its mid portion to form a stem; a second shell'having guidingl slots, the ends of the head of the T-Shaped operating member being received in the slots in both shells, these head ends carrying portions Whieh engage the outer side of the second shell and which serve to exert spreading action upon the stem of the T- Shaped operating` member.

2. The combination With a choke valve 'for an internal Combustion engine; of a push and pull rod Connected with the valve to operate it; a handle mounted to turn; a shell secured to and coaxial with the handle and formed with an inclined earn slot;` an operatingmember connected with Said lrod and engaged in said eam slot; a mounting plate for the handle; and a spring interposed between said mounting plate and shell.

In Witness whereof, I hereunto Subscribe my name. Y

WILLIAM SGHMID. 

